Speedometer.



SPEEDOMETER.

1011:1011 FILED 131 3.12, 1911 ATP Patented Sept. 8, 1914.

3 SHEETSSHBET l.

Inventor rhzaw Fi OQZQ A. 1:". POOLE.

SPEEDOMETER.

APPLICATION FILED APR. 12, 1911.

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SPEEDOMETER.

APPLICATION FILED APR.12,1911. T. J. i: 1 r1 i. v 1,1 lfifli Pawnhea new. 8, 19A

3 $HSETS $HBET C.

45 lution of the shaft, the flipper drops from lution of the primary which is operated at a speed proportional to the speed of the axle. Clutch mechanism I is provided which holds this intermediate i shaft of the meter cured by adjusting the tension of the resilient agent by means oi which the flipper moves.

As before stated, I provide a sparking circuit, as an auxiliary feature, which provides for reading the scale at night. In order to do this, I make the annular scale and the indicating hand of metal and the space between them constitutes the spark gap. Furthermore, so that a very bright spark may be secured, I provide av novel sparking circuit, involving an entirely new arrangement of condensing elements, and by means of this circuit I secure the desired results.

My invention is embodied in the device illustrated in the accompanying drawings in which Figure 1 is a face view thereof; Fig. 2 is an eievational view ofthe interior mechanism, the casing and some of the parts contained thercb y being shown in section taken setting piece in any position, this clutch mechanism-being of such construction that the intermediate setting piece may be adl vanced but may not be setback except by a j definite pi'isitive actuation by the dog is ferred to. Thus, if the speed is increased the dog will actuate merely to advance the intermediate setting. piece slightly, whereas, if the speed is decreased, the clutch mechanism, when actuated, will release the intermediate setting piece, which then returns toward the zero position.

The indicating mechanism isloperatively connected with the intermediate setting means and. since. as will be seen, the inter mediate setting iece operatesthrough an are less than hal f a circle, these parts are connected together in such-a manner that the indicating hand may operate throu h nearly a"complete circle, thuspifdiiding f dr more ready and accurate reading of the,

scale. The indicating means is held in any set position by means ofclutch/mechanism similar to the clutch mechanism which has been described as associatedzav'ith the "intermediate setting ine'ansand', operating like that clutch mechani-snnz'it permits the advance of the indicatii'ig hand but"prevents its return except by means of a positive actuation by the dog.

The dog which has been referred to is pivotally mounted upon a cam whichis secured upon the shaft and is thus operated at a speed proportional to the speed of thevehiole. This cam is so mechanically" associated in with the flipper that, once for each revoluton of the shaft, it winds'the flipper mechanism, that is, it places the spring, which is connected with the ipper, under tension. Consistentlyfonce for each revolooking in the direction indicated by the arrows;'Fig. 3 is a view on a plane parallel to that of Fig. 1, being practically the plane of the line 3-3 of Fig. 2, and looking in the direction indicated by the arrows; Fig. 4: is another =view on a plane parallel to that of Fig. 1, being substantially the plane of the line H of Fig. 2, and looking in the direction indicated by the arrows; Fig. 5 is a view similar to Fig. 3, some of the parts being removed, however, and the flipper be ing shown in position just after having dropped from the cam surface. Fig. 6 is a isolated from the others and illustrating the cam in another position. Fig. 7 is an isolated view-showing the parts for connecting the intermediate setting piece and the indicator mechanism. Fig. 8 isa view of the backplate of the device, showing some of the parts carried thereby. Fig. 9 is a diametrical sectional view of the bearing on which the cam is mounted, being taken approximately on the plane of the line 9-9 of Fig. 3 and looking in the direction indicated by the arrows. Fig. 10 is an enlarged view of the clutch mechanism, being a sectional view taken approximately one. the plane of the line 10--10 of Fig. i and looking in the direction indicated by the arrows. Fig. 11 is a face view of a spring plate which is employed to keep some of the parts in proper position. Fig. 12 is a sectional view showing the parts for conducting the current from the external circuit to the dial plate. Fig. 13 is a diagrammatic View of the circuit which I employ.

ike reference characters are applied to the same parts throughout the various figures.

The entire mechanism of my device is disposed within a small circular: casing which comprlses a stepped annulus 14., a glass front the cam --surface. This drop takes place during the constant period of time referred to and, at the end, the flipper engages means which normally retains the dog in one position. so as to release the dog and thus permit it to move into another position. The former position is the one in which the dog carries the intermediate setting piece with it. hen the detent means is removed, the

dog, moving to its other position, no longer carries the intermediate setting piece with it, and the latter is left inwhatever position it has been placed. Passing the zone of the intermediate setting piece, the dog is automatically reset so that it may properly operate the clutch mechanisms which have been referred to and the intermediate setting means and theindicating moans assume positions to designate the speed at which the shaft has been moving. Calibration is sei on the plane of the line 22 of Fig. l and view similar to Fig. 3, showing several parts 105 fragmentary is then carried the remainder of its counterclockwise travel under theinfluence of the springdfi.

As best shown in Fig 9 the joined collar and sleeve 28 provided with the axial bore in which a plunger 54 is dispose The sleeve 28 has a pocket 55, which is closedby means of a plug 56 in which the downward extension 57 of the plunger is guided. A helical spring 58 surrounds this extension in the pocket and tends to maintain the plunger at the upward limit of its movement. The plunger is also provided with an upward extension 59 which protrudes beyond the plane of the .cam and thus forms a detent member for the dog 60 which is pivotally secured at 61 to the cam. On one side, this dog is adapte to enthe head of the screw 36 and when the dog is in this position the detent 59 engages the other side thereof to hold it in positive relation to the cam. A leaf spring 62, mounted upon a post 63 on the cam, bears against the dog and tends to throw it away from the head of the screw. As is evident,

. this tendency is normally blocked by the detent but it will appear that when the detent is drawn downwardly into the bore the spring will be free to act and the dog will be moved in a clockwise direction (Fig. 3). The dog 60, as best shown in Figs. 2 and 3, is provided with the forward extension 641 which, as will'be described, is arranged to engage the intermediate setting piece and parts of the clutch mechanisms in order to open them.

Pivotally mounted at 65 in a bearing 66 on the back plate 17 is a bell crank lever 67 which, as shown in Fig. 9,, extends forwardly into the plane of the flipper and downwardly to the extension 57 on the plunger 54. In Fig. 9, where this arrangement is shown upright, the arm 68 of the bell cranlr lever is bifurcated at its end so that it may engage in a peripheral groove in the extension '57. Theother arm 7 0, which extends to the plane of the flipper, is arranged to be engaged by a lug 71 which is secured in proper position upon the flipper and this engagement is such as to turn the bell crank lever to draw the detent' 59 into the bore and to thus release the dog 60 so that it may act under the influence of the spring 62. The position of the lug 71 on the flipper is important and is determined so that atxthe time that the corner 46 of the flipper is at the end 47 of the cam surface the lug will be a definite distance from the position it must assume to bring the detent 59 into the bore to release the dog-and this definite distance, under the influence of the resilient means connected with the flipper, is always traversed in the same predetermined period of time.

The mechanism which has been described and a radially extending arm which forms the intermediate setting piece hcreinbefore referred to. lhe piece 75 is pro-- vided with a. pin 75 which extends through a slot 77 in the plate 20, this slot being concentric with the shaft ii", and into the path of the forward extension 64ion the dog 60. A spring TS, connected between the disk T5 and the plate 20, tends to hold, the piece 75 at the limit of. its cloclnvisemovement (Fig. The extension 6% onfthe dog is arranged to engage the pin 76, as illustrated in Fig. .2, when the dog is in its active position, that is the position in which it is locked rigidly to the cam.

sion 6 will engage the pin 76 and. will carry the setting piece 75 around with it until the detent 59 has been drawn into the bore, by means of the engagement between the lug 71 on the flipper and the bell crank lever, and then the dog will move to its passive position and will leave the intermc- 'dia'te setting piece in whatever position it has carried it to. The parts so arranged that. if the intermediate setting piece is at the limit of its cloclsi ise movement, the eX- tension or will engage the pin 76 just at the time that the corner 46 of the flipper is released from the end 4? of the cam surface. As will more fully appear hereinafter, however, it is possible, particularly at high speeds, that the intermediate setting piece does not have the opportunity to reach the limit of its clockwise movement before the dog again comes around to engage itbut this is a matter of indillerence so far as the operation is concerned.

The clutch mechanism, with which the clutch disk 1 cooperates, is best illustrated in Figs. 4 and 10. The'clutch comprises a stationary fork 79 secured to the plate 20 in any suitable manner and a fork 80, which is adapted engage over the first fork, and which ispivoted at 81 to the plate, the fcrks bring held in engagement by means 01" a spring 82 connected between the tail of the pivoted fork and the plate. The forks are'adapted to embrace the clutch disc 74 as illustrated in Fig. 10" and the stationary or inner fork is I openings 83, 83 for the reception of clutch balls Sly 8% which are held in place by means of the tangs of the pivoted fork. The tangs of the pivoted fork converge so that as they approach the tan gs or the stationar fork they will tend. to jam the hal s in place and, if the disk passes ween the balls,

provided at its end with w it will now appear that i as the dog rotates with the cam, the eXtenlie the individual... operations of the various parts throughout the structural descriptions,

'I think it advisable to append a brief exdirection and, during such operation, the extension 64 on the dog carries the 1nter-' mediate setting piece with it unless the latter is already disposed in an advanced position. /Vhen the corner of the flipper reaches the end of the cam surface, the flipper is free to act under the influence of the resilient means connected ther'ewithand it oscillates anti-clockwise so that the lug 71 there on comes into engagement with the bell crank lever. To release the dog and to prevent its affecting the intermediate setting piece any farther if it has affected it at all,

the length of time between the instant that the flipper drops and the instant that the dog is released is carefully calibrated and isalways the same. If the rotary element is running at a high rate of speed the dog will. carry the intermediate setting piece farther than if it is rotating at a low rate of speed. After having brought the intermediate set ting piece to a definite position, determined by the release of the .dog and its change to its passive position, the dog is restored to its active position. As the intermediate setting piece swings over in a connterclockwise direction, the pin 87 carried thereby rotates the gear 86 owing to the engagement of the pin 87 in the slot 88 as shown in Fig. 7 and in this way the hand is inoved in a clockwise direction through the gears 75 and 89, these movements being permitted. by the clutches as heretofore described. The dog,

thus in its active position, approachesthe piece 95 and, engaging it, opens the clutch.

However, considering the machine as just started, the gear 86* is in engagement with the pin 87 in the relation shown in Fig. 7 and. nothing will occur because the clutch members 79 and 80 hold the intermediate. setting piece thus previmting movement .of the gears. .As the dog proceeds in its rotation it engages the piece and the'momentary opening oi the clutch of the intermediate mechanism will permit the inter1nediatc setting piece to drop back under the action of the spring 78 toward the limit of its clockwise movement mirrying the pin towardthe other end of the slot liccanse the gear 86 is held by the other clutch. it will ting piece will be remembered that the opening of the clutch of the indicating mechanism was merely momentary and that the indicating mechanism is again locked in position by the time that the dog reaches the piece 85,- therefore, the release of the intermediate mechanism does not affect the indicating mechanism at this time. ceeds in its rotation, however, it again picks up the intermediate setting piece and again carries it to a position dependent upon the speed, but no forward movement of the gear 86 will occur until the pin 87 reaches'the right-hand end of the slot 88. It is possible, as hereinbefore pointed out, thatthe dog will catch .theintermediate setting piece be fore the latter is returned to the limit of itsv clockwise movement Therefore, particularly on high speeds,v the intermediate setutter more or less but this is of no consequence since the limit of its counterclockwise movement is the important consideration. The slot 88 in the gear S6is sufficient to permit this fluttering of the intermediate setting piece with out moving the gear.

If the speed increases the intermediate setting piece is carried around a little farther each time and the indicating-means is advanced merely by its being shoved ahead correspondingly, since the clutch mechanism As the dog prolimit of its clockwise movement, it proceeds I to release the clutch of the indicating mechanism so that thatimechanism may drop back under the action of the-spring 86 which rotates the gear 86 in a clockwise direction to corresptmd with the new position of the intermediate setting piccp, this being determined by the engagement be-.

tween the right-hand end of the slot 88 in the gear 86 audlhc pin T8. Summarizing, the first engagement of the dog sets the intermcdiale setting piece. and rotates the gears 75 and 89 since the relation of the partsis as shown in Fig. 7 lhesecond engagement pc'bmits the setting of the indicating mechanism relative. to the intermediate piece, and the third engagement releases the intermedialc piecc for its next setting--thc next set ting then takes place, and the indicating mechanism is then adjusted to the new ot ting,and so on. In. this way the indicating mechanism indicates the speed at which the I way and this kind in spark co will jinn p from the terminal 115 to the ring before the voltage has reached a point at which the current will innp from the point 116. The amount of" electricity which can pass from the point 115 to the however, is very small on account of the very small capacity of the condenser 0. The re sult, thereiore, that the tiny spark which passes in this preliminary way ionizes the air between the main contacts, and When this been accomplished the spark will jump across the contacts- 116, 104-, at a very much lower voltage or a considerably greater spark will be produced with the same voltage. The condensing element 0 is spaced from the hand by means of rubber studs 117, ll? and it important that the- Wire is not connected with the hand at any point or with any other part of the circuit. The gap between the hand and the Wire must be greater than the gap between the point 116 andlhe ring. for. otherwise, the spark would jump. from the hand to the auxiliary wire and from the terminal of the Wire to the ring.

The purpose of the condenser m is ultimately to cause tzlieniain spark to be more visible to the eye than would otherwise be the. case. It gives to the spark the character of the sparkfrom. a Leyden jar as distinguished from. the spark which is given from the tern'iinals of the secondary of an (n'dinar induction coil. The high tension current discharged from the secondary winding is in part absorbed by the condenser which then gives out its charge as the spark 1 asses between the terminals of the spark gap. The result is that the current passes for a longer time between the terminals of the gap than would otherwise be the case and it also passes at a lower voltage. A comp tively rcd spn la is s ci red in this sidorahly more visible than the blue or violet spark oi the induction coil not so connected. It will appear that one can boci'inic. accustomed to the scale and can determine the indication entirely independent of the figiiircs on the dial nhne. l-imvever, the spark illuminates the lill plain to such an extent; that the figures can readily be seen :it night and I find it advisable therefore to place the Scale nnd'or the circular zone. in which sparking lakes place. iin as new and desire to secure by Letters Pat-cut:

l. in a. spcedonn-r'h \olviugz cam, means ,ior revolving said cam.

in. combination, a re a movable dog carried by said i It, it time ing an active and an inactu-c nos; element for moving said to its inactive .w

advanced by said d volving can), means for revolving said cam, a movable dog carried by said cam and having an active and inactive position, a time element controlling the position of said dog, means for moving said dog to its inactive position, setting means advanced by said dog in its active posit-ion, and setting means for said dog.

3. In aspeedonieter, in combination, a revolving cam, means for revolving said cam, a movable dog carried by said cam and having an active and an inactive position, a time clement controlling the position. of said dog, setting means advanced by said dog in its active position, a one-Way, clutch for said setting means: and indicating means, the position of -which is determined by said setting means, said setting means and indicating means being connects-(1.,

In a speedometer, in combination, a resolving cam, means for revolving said cam, a movable dog carried by said cam and having an active and an inactive position, a time clement controlling the position of said dog, se ting means moved by said dog When in its active position once every revolution tiiereof, clutch for holding said setting incans in position, said dog releasing said clutch during each revolution, and'indicating means, the position of which is deter- 95 mined bysaid setting means.

51in a speedometer, in combination, a' re volving cam,means for revolving said cam,

a movable dog carried by said cam and having an active and an inactive position, a time element controlling the position of said dog, set-ting means moved by said dog when in its active position once every revolution thereof, a clutch for holding said setting means in position, said dog releasing said clutch during each revolution, indicating 1 means, the position of which is determined by said setting memo, and a clutch for holding said in (.iicnting means in position, saith dog releasing said last-harried clutch di'iring 'llfl ouch revolution thereof.

6, lo a speedometer, in combination, a rerolvi. cam, means for revolving said can), n flipper following said cam to he moved in one direction, resilient means 'for' moving said tli. )per in the other direction, odog car ried h said cam and having an active and an inactive position, spring means actingagainst sn id dog, dctcnt n'icchanisn'i adapted to be actuated by sniilliip 'ler,the drop of .nid, flipper serving to engage said detent hanism to shift said dog from its active to its inactive position, and a setting piece advanced by dog in its active position.

7. In a speedometer, in combination, a revolving cam, means for revolving said 151-111, :2 'llippcr following said com to be moved in one direction, resilient'means for moving id f ipper in the other direction, a dog can by said. cam and having an active and,

anion-es an inactive position, spring means acing against sail clog, detent mechanism adaptec to be actuated by sairl flipper, the clrop of said. flipper serving to engage said cletcnt mechanis a to shift said dog from its active to its inactive posi a setting piece ml, 6. by said clog in its active position, and .sat'ng means, the position of Whic is i e5. by said setting piece.

- speedometer, in combination, 1y, a cam carried by aid be ,emher of considerable Weight following sai-cl cam, a resi aintaining said member l conn said cam, means for the or said resilient agent, aclog carried said cam, a plunger axially mutated. in said hoclv ancl normally acting a cletent to loci; l clog to said cam in its active po sition, sprin means acting sairl dog,

when missed-passing to an inactive position,

a'hell crank lever connected with saicl 3 31 anger and arranged for engagement by part on saicl member to release the clog, a setting piece arranged to be advanced by said .clog when it is lockecl to the cam, spring, a clutch for holding the setting p e so ml- Vancecl against the tension said spring,

second spring, indicating mechanism conforming to the position of saicl setting piece by the action of sai' second-named spring, anal aclutch for hold ng said indicating mechanism in position, sari clog serving to open said clot-shes in each revolution.

9, in a speecloinetenin so lnation, revolving earn, a flipper follows) saicl cam to he moved in one lirection, a resilient agent direction, a

for m ring saicl flipper in the other threetion, ancl a stronger resilient agent which comes into action only when said flipper is near the limit of its movement in the firstnamed direction, said last-namecl agent servin to im art an initial imnnlse to said flipper in the said other direction.

1-). In a speedometer, in combination, a

revolving earn, a flipper following said camto be moved in one direct-ion, a resilient agent for moving said flipper in the other stronger resilient agent which come into action only when said. flipper is near the limit of its movement in the firstnamecl direction, saicl last-name l agent serving to impart an initial impulse to said flipper in the said other "lirection, and adjustable means for limiting the range of action of saicl stronger agent.

11. In a speedometer, a constant time element, a variable element, a setting piece advanced by said variahleelcment, said constant time element determining the length of time of such advancement, a metallic inclicator han l mechanically associateci with said setting piece, a metallic plate associated with said hand, and an elect-i sparking circuit including said hand and plate as spark gap. terminals.

in witness whereof, I hereunto subscribe my name this 8th clay oi' April, 1911.

ARTHUR F. POCLE.

LnoNAnn Boson. 

